Using the Information Structure Model to Compare Profile-Based Information Filtering Systems

In the IR field it is clear that the value of a system depends on the cost and benefit profiles of its users. It would seem obvious that different users would prefer different systems. In the TREC-9 filtering track, systems are evaluated by a utility measure specifying a given cost and benefit. However, in the study of decision systems it is known that, in some cases, one system may be unconditionally better than another. In this paper we employ a decision theoretic approach to find conditions under which an Information Filtering (IF) system is unconditionally superior to another for all users regardless of their cost and benefit profiles.It is well known that if two IF systems have equal precision the system with better recall will be preferred by all users. Similarly, with equal recall, better precision is universally preferred. We confirm these known results and discover an unexpected dominance relation in which a system with lower recall will be universally preferred provided its precision is sufficiently higher.     

关于三段论一般规则存在依据的思考

三段论理论是人类有史以来第一个真正的理论体系.选择有效式是构造三段论理论重要的一环.三段论一般规则是一种最简单实用的选择方法,但却存在理由不足的缺陷.包含关系的概念内涵之间所具有的蕴涵关系,能够单一地引申或者说充分地论证三段论全部一般规则,甚至能直接识别出三段论每一个具体的有效式,从而为采用一般规则做有效式选择标准的三段论理论提供了可靠的理论依据.     

Using Context Clue in Reading

The context of a word consists of the other words surrounding it and the situation in which it is used.When we come across a new word in our reading,instead of looking it up in a dictionary for its definition,we can guess its meaning from its context.     

系统功能语言学与关联理论的互补性

关联理论可以极好地弥补系统功能语法的不足,解决会话中的含义识解问题。尤其是二者语境观的相互借鉴及有机结合对我们解释语用、翻译、二语习得等方面的问题都大有裨益。     

简论跨文化交际的失误

跨越不同文化背景的交际常会发生故障 ,使交际双方产生误解其原因不仅限于发音、语法和词汇等语言各方面 ,还有其它如文化背景的原因 ,影响了有效交际 ,本文就此进行了初步探讨     

语境与精读教学

文章综述了几位语言学家对语境构成因素的研究,分析了精读课的特点,指出了在精读教学中,教师应该将语境因素与课文的讲解有机地结合起来,同时建议教师应该学习更多有关目的语国家的知识,以满足课堂教学的需要。     

图书馆讲座——开创公共空间的重要载体

图书馆是公共空间的重要载体,图书馆讲座作为图书馆的核心业务之一,直接参与了公共空间的构建.文章从公共领域的理论视角详细阐述了图书馆讲座所负有的构建公共空间的内涵所指,及其历史现状,尝试为图书馆讲座确立新的价值定位.     

The Archival Bond

This paper presents the concept of archival bond as formulated by archival science and used in a research project carried out at the University of British Columbia, entitled The Preservation of Electronic Records. Being one of the essential components of the record, the concept of archival bond is discussed in the context of the traditional diplomatic and archival definitions of records, and its function in demonstrating the reliability and authenticity of records is shown. The most serious challenge with which we are confronted is to make explicit and preserve intact over the long term the archival bond between electronic and non electronic records belonging in the same aggregations.     

科技论文文体结构所体现的美学特征

作为审美对象的科技论文,是作者通过科学实验和理性思维创造的一种美的结晶,其文体结构的美学特征主要体现为学术创新、真实可靠的科学美,结构严谨、层次清晰的形式美和准确简洁、朴实明白的语言美.     

图书馆评估类型的理论重组

针对学界和业界对图书馆评估类型问题迫切需要进行理论上的重组这一状况，论述图书馆评估在理论上存在着一个开放的类型体系。从图书馆评估的本质属性出发，可以把它划分为鉴定性、建设性、发展性和审美性等实质评估类型;从图书馆评估的外部属性出发，可以把它分别划为广义和狭义、前置性和形成性及总结性、外部和内部、相对和绝对等形式评估类型。